| 年度 | 实际值 |
|---|---|
| 1995 | 19.7 |
| 1996 | 18.3 |
| 1997 | 29.4 |
| 1998 | 25.9 |
| 1999 | 27.2 |
| 2000 | 26.6 |
| 2001 | 28.49 |
| 2002 | 31.63 |
| 2003 | 34.55 |
| 2004 | 39.91 |
| 2005 | |
| 2006 | 46.35 |
| 2007 | 54.19 |
| 2008 | 56.63 |
| 2009 | |
| 2010 | 54.64 |
| 2011 | 56.11 |
| 2012 | 56.91 |
| 2013 | 60.24 |
| 2014 | 62.26 |
| 2015 | 60.86 |
| 2016 | 60.54 |
| 2017 | 60.2 |
| 2018 | 54.26 |